As a general rule if the insulation is 2 thick or less a 4 by 4 is sufficient.
Rigid insulation slope to roof drain dimensions parapet.
The cure for parapetitus is continuity of the control layers and letting things move when they have to move.
Localized drainage at drains.
Max baker and stonewall jackson would be proud.
Find out why in the seller s fact sheet on r values.
Minimum slope of per foot as required by the international building code ibc toward roof drains or scupper drains leaving no fl at areas for ponding.
Built up roofs shall have a design slope of not less than one fourth unit vertical in 12 units horizontal 2 percent slope for drainage except for coal tar built up roofs that shall have a design slope of not less than one eighth unit vertical in 12 units horizontal 1 percent slope.
Tapered roof insulation systems are designed to provide a 1 savings vary.
The standard tapered panel size is 4 x 4.
The perimeter of the roof assembly insulation is wrapped to prevent interstitial airflow from the parapet into the multilayered rigid insulation of the field of the roof.
Because of its size and customization options tapered eps often can be installed in a single layer.
As a general rule if the insulation is two inches thick or less a 4 foot by 4 foot sump is sufficient.
Higher r values mean greater insulating power.
Over structural slope when roof drains are located a great distance away from a sloped roof edge more than 48 it can be more cost effective to use a tapered backwash.
A typical interior roof drain assembly occupies about a 4 by 4 square area with a per foot tapered slope.
If the insulation reaches 3 or thicker an 8 by 8 creates a more gradual slope while still providing the necessary momentum.